1d03c1e rwlock initialization does not return value

Authored and Committed by pemensik 3 years ago
    rwlock initialization does not return value
    
    API has changed, it no longer returns a value in isc_rwlock_init.
    It returned always ISC_SUCCCESS on 9.16 anyway, so skip the check
    on every 9.16 build.
    
        
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